Consolidated Statements of Changes in Shareholders' Equity (USD $)	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Comprehensive Income [Member]	Total
Balance at Dec. 31, 2008	$ 11,036,687	$ 32,668,530	$ (2,217,280)		$ 41,487,937
Comprehensive income:
Net income		3,417,478		3,417,478	3,417,478
Other comprehensive income net of tax:
Unrealized holding gains (losses) on securities available for sale, net of deferred tax benefit			(477,999)	(477,999)
Add: reclassification adjustments for other-than-temporary impairment, net of tax			509,278	509,278
Add: change in beneficial obligation for defined benefit and SERP plans, net of deferred tax			262,539	262,539	262,539
Add: reclassification adjustments for other-than-temporary impairment, net of tax			(509,278)	(509,278)
Other comprehensive income (loss) net of tax				293,818	293,818
Total comprehensive income				3,711,296
Cash dividends		(2,877,259)			(2,877,259)
Amortization of unearned compensation, restricted stock awards		208,666			208,666
Issuance of common stock - nonvested shares	33,131	(33,131)			0
Exercise of stock options	33,553	74,649			108,202
Balance at Dec. 31, 2009	11,103,371	33,458,933	(1,923,462)		42,638,843
Comprehensive income:
Net income		3,667,316		3,667,316	3,667,316
Other comprehensive income net of tax:
Unrealized holding gains (losses) on securities available for sale, net of deferred tax benefit			(1,125,344)	(1,125,344)
Less: gain on sale or call of securities available for sale, net of tax			(357,132)	(357,132)
Add: reclassification adjustments for other-than-temporary impairment, net of tax			(926,345)	(926,345)
Add: change in beneficial obligation for defined benefit and SERP plans, net of deferred tax			402,579	402,579	402,579
Add: reclassification adjustments for other-than-temporary impairment, net of tax			926,345	926,345
Other comprehensive income (loss) net of tax			(141,226)	(141,226)	(141,226)
Interest rate swap (cash flow hedge), net of tax benefit			12,326	12,326
Total comprehensive income				3,526,090
Cash dividends		(2,615,023)			(2,615,023)
Amortization of unearned compensation, restricted stock awards		246,789			246,789
Issuance of common stock - nonvested shares	90,291	(90,291)
Issuance of common stock - vested shares	20,414	69,459			89,873
Exercise of stock options	63,270	155,722			218,992
Balance at Dec. 31, 2010	11,277,346	34,892,905	(2,064,688)		44,105,563
Comprehensive income:
Net income		4,117,415		4,117,415	4,117,415
Other comprehensive income net of tax:
Unrealized holding gains (losses) on securities available for sale, net of deferred tax benefit			700,941	700,941
Less: gain on sale or call of securities available for sale, net of tax			(67,631)	(67,631)
Add: reclassification adjustments for other-than-temporary impairment, net of tax			(124,824)	(124,824)
Add: change in beneficial obligation for defined benefit and SERP plans, net of deferred tax			181,717	181,717	181,717
Add: reclassification adjustments for other-than-temporary impairment, net of tax			124,824	124,824
Other comprehensive income (loss) net of tax				747,291	747,291
Interest rate swap (cash flow hedge), net of tax benefit			(192,560)	(192,560)
Total comprehensive income				4,864,706
Cash dividends		(1,761,483)			(1,761,483)
Amortization of unearned compensation, restricted stock awards		136,593			136,593
Issuance of common stock - nonvested shares	34,161	(34,161)			0
Issuance of common stock - vested shares	14,874	53,080			67,954
Exercise of stock options	58,011	99,516			157,527
Balance at Dec. 31, 2011	$ 11,384,392	$ 37,503,865	$ (1,317,397)		$ 47,570,860